Lovely images here in the report. The lifetime of such dust and gas structures is likely short compared to the age of the universe today in the BB model, said to be at least 13.8 billion years old. All galaxies with spiral arms are short lived too, only about 80 to 180 million years max. Lifetime of spurs in galaxies,
https://ui.adsabs.harvard.edu/abs/1982A&A...116..117F/abstract, December 1982.
https://phys.org/news/2021-08-astronomers-milky-spiral-arms.html My observation. This was refreshing to read here. "Astronomers don't yet fully understand what causes spiral arms to form in galaxies like ours." Maintaining spiral arms is difficult too, especially when using long ages like the age of the universe or 10 billion year time scales. Other reports indicate spiral arms live only about 80 to 200 million years if that long and must then be regenerated to explain the population of spiral galaxies seen in the universe today. This high pitch angle structure reported is clearly young composed of various YSO and said to be some 950 pc long. The high pitch angle structure origin is difficult to explain too.
In astronomy, there is plenty of evidence for very young structures all around in galaxies.
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